Cutter mounting



lJudy 5, 1938'.

Filed Feb. 25, 1937 I l Y l I 6 i f l 2 Nil f/ .I 'Z L lll 1 l 5 N3/0-8' I g 5 "sl 7' 0r/M 3 I I \I l* l 7w i /5v I 2 "/l I 4 v /8 ff l 'Il5 *YA- /6 El @A a'Cm/tll:

INVENTOR ATTORNEY Patented July 5, 19348.

PATENT OFFICE CUTTER MOUNTING Fred. C. Smith, Jr., Houston, Tex.,assigner to Hughes Tool Company, Houston, Tex., a. corporation oi.'Delaware Application February 25, 1937, serial No. 127,578

vil'Claims.

The invention relates to cutters such as are employed upon reamersdesigned for use in deep well drilling. l

The invention pertains more particularly to they means for mountingand.l supporting the cutter I in the head of kthe reamer andhas for itsobject y the formation of a supporting block for the ends of the cutterpin which may be easily and quickly applied and locked.

I aim to provide a mounting for the cutter pin which is of simple andstrong construction and easily secured in place so that it will notbecome loosened.

The invention resides particularly in the construction of the supportingblock and its means of attachment in supporting -position in. the reamerhead.

In the drawing herewith Fig. 1 is a side view of a broken lsection ofthe reamer head showing the cutter mounted therein by the use of myinvention.

Fig. 2 is a transverse section on the plane 2-2 of Fig. 1. i

Fig. 3 is a perspective view block.-

Fig. 4 is a perspective view of the locking plate.

The head of the reamer may be of any desired construction. I show a headI of generally cylindrical contour with outwardly projecting ribs orbosses 3 thereon spaced apart vertically to include the reamer cuttersbetween them. I show supports for three cutters, as will be seen fromFig. 2, but a different number of cutters may be used.

Adjacent each cutter the body oi the reamer is the cutter supportingblock 1.

The cutter is shown asl approximately cylindrical but with its endstapered as desired at 8 and 9 at the upper and lower ends respectively.Each end has thereon a bearing pin Ill to ilt within'a bearing openingIl within the bearing block 1. The-bearing blocks at each end are of thesame construction. In Fig. 3 one of the bearing blocks is showndetached. The recess Il extends away from the cutter recess about halt`way through the block. The block is dovetailed longitudinally andtapered longitudinally to t loosely within the mortised recess 6 of thehead. As will be seen from Fig. 2, l

each block is narrower in width than the recess I to permit the wedgeplate I! to be 'introduced ofl the supporting into the recess besidevthe block and lock the block in place.

0n the side of the block away from the wedge, the block has atransversely extending rib I3 to fit within a keyway or groove I4 in theside of the recess 6, and there prevent longitudinal movement of theblock in said recess.

'Ihe wedge plate, shown in Fig. 4, is wedge shaped both longitudinallyand transversely. That is it tapers in thickness away from the end i5and from the side I6. At the larger end the block has a. locking arm I1at approximately right angles thereto, said arm having an opening I8thereinto receive a cap screw i9, by means of which it is secured to theblock 1. 'I'he double wedge shape of the wedge plate enables the plateto wedge the block 'l rigidly into position with the ridge l 3- thereontightly fitting within the groove I4 in the recess 6 as will be seen inFig. 1. It further tends to prevent the plate from being moved outwardlyfrom the mortised recess 6 as will be obvious from Fig. 2. The lockingplate will be driven into the position shown in Fig. 1 and then xed inthat position by the cap screw I9. v

It will be clear that before the cutter 5 is placed in its recess 4,.the supporting bloclm 1 may be slipped over the ends of the pins I0 andthe whole assembly moved as a unit into position ready to receive thewedges. The wedge plates will then be driven in place'to force theblocks into rigid engagement with the walls of the recesses 6 and theridges .I3 thereon tted within the grooves I4. The cap screws I9 nx thewedgev plates to the supporting blocks 1. A lock washer 20 may be usedto prevent release of the cap screw. The wedge plate engages against thetaperedside of the block 1 and a very tight ilt of the assembled blockand wedge in the recess 6 is thus obtained.

It will be noted that this assembly is very easily and quickly made. Theparts are simple and economical to ymanuacture and may be replaced whenworn without appreciable loss of time or materials. Toremove the'blocks,itis only necessary to unscrew the cap screws and by engaging a driftpin or wedge under the arm Il of the wedge plate, the wedge may beremoved. The block will then drop free and may be removed.

f What I claim as new is: 1. A reamer body having a plurality of cuttenpockets therein, a reamer cutter in each pocket,

a mortised recess at each end of each of said pockets, one side of eachrecess having a transverse groove, a bearing pin at each end of eachcutter, a bearing block to receive said pin, said block being mortisedto t loosely in said recess, a ridge thereon to engage said groove, anda longitudinally tapered wedge plate formed to engage the side of saidblock opposite said ridge and within said recess to wedge said block inposition.

2. A reamer body having a plurality of cutter pockets therein, a reamercutter in each pocket, a mortised recess at each end of each of saidpockets, one side of each recess having a transverse groove, a bearingpin at each end of each 3. A reamer body having a plurality oif 'cutterpockets therein, a reamer cutter in each pocket, a mortised recess ateach end of each of said pockets, one side of each recess having atransverse groove, a bearing pin at each end of each cutter, a bearingblock to receive said pin, said block being mortised to t loosely'insaid recess, a ridge thereon to engage said groove, and a longitudinallytapered wedge plate formed to engage the side of said block oppositesaid ridge and within said recess to wedge said block in position, alaterally extending arm on the larger end of said Wedge plate, and ascrew to-secure said arm to said block.

4. A reamer body having a cutter receiving pocket, bearing blockreceiving recesses at the upper and lower ends of said pocket, [bearingblocks in said recesses, a cutter in said pocket, bearing pins at eachend of said cutters to engage within bearing openings in said blocks,means at one side of each block intermediate its ends interengaging withthe side wall of its recess to prevent longitudinal movement of theblock in the recess, and means to force said block laterally 6. Aquadrangular bearing block having a bearv ing recess therein for acutter axis, said block being formed with an inner side wider than theopposite outer side to t a mortised recess, the other sides between theouter and inner sides being formed, one with a transverse ridge thereon:and the other side formed to taper longitudinally of the block tointerflt with a Wedge shaped plate and a cap` screw engaging with saidblock at the end opposite said bearing recess."

7. A reamer body,v a cutter mounted thereon, longitudinally extendingbearing projections on said cutter, a mortised recess in said body ateach end of said cutter, a dovetailed bearing block in each recesshaving a. bearing socket to receive lone ofl said projections, saidblock being tapered on one side, a projection on the opposite sideengaging the wall of said recess, and a Wedge plate to fit within saidrecess on the tapered side of said block and hold said projection insaid wall.

8. A reamer body, upper and lower projections thereon, said projectionshaving longitudinally mortised recesses therein, a cutter between saidrecesses, supporting blocks at each end of said cutter in said recesses,means to support said cutter rotatably relative to said blocks,interengaging means between one `side of each of said blocks and. thewall of its recess, and a wedge to engage between said block and theopposite wall of said recess and force said interengaging means intolocking position.

FRED. C. SMITH, JR.

